Hook Trolley Tilting Mechanism for Pulp Unit Lifting
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Solution Overview
Problem
Existing lifting apparatuses for pulp units with hook trolleys are complex due to the need for flexible fastening and distance adjustments, requiring human intervention and complicating the lifting process.
Innovation Solution
A lifting apparatus with a horizontal beam and hook trolleys that can tilt and move vertically to accommodate height differences, equipped with two pairs of grabbing means per trolley to simplify the structure and allow for simultaneous lifting of multiple pulp units without needing to lower the beam, ensuring hooks engage correctly under the straps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible fastening and distance adjustment mechanisms are added to hook trolleys to prevent pressing and penetrate into pulp units, then the reliability of lifting is improved, but the device complexity increases significantly
Solution Approach 1:
The patent extracts the flexible fastening and distance adjustment mechanisms from the hook trolley structure itself, eliminating the need for complex springs, dampers, and adjustment devices within each trolley. Instead, the system uses a simple rigid trolley design where the beam can be lowered to accommodate height differences, separating the complexity from the trolley while maintaining lifting reliability
Solution Approach 2:
Rather than making each hook trolley flexible and adjustable to handle height differences, the patent inverts the approach by making the trolleys rigid and simple, and instead allowing the entire beam structure to be lowered vertically. This reverses which component handles the adaptation to varying pulp unit heights, simplifying the trolley design while maintaining reliability
2Adaptability or versatility
If the horizontal beam is lowered onto pulp units to accommodate height differences, then the adaptability to varying heights is improved, but the force applied to the pulp units increases causing damage
Solution Approach 1:
The patent introduces the vertical movement capability of the hook trolleys along the beam as an intermediary mechanism. This allows the trolleys to descend vertically to reach pulp units of varying heights without requiring the entire beam to be lowered onto them, thus accommodating height differences while preventing excessive force application and damage to the pulp units
3Productivity
If multiple hook trolleys are used to lift multiple pulp units simultaneously, then the productivity is improved, but the coordination and distance adjustment between trolleys becomes more complex
Solution Approach 1:
The patent segments the lifting system into multiple independent hook trolleys that can operate simultaneously on the same beam. Each trolley is a simple, identical unit that can be positioned at different locations along the beam, allowing multiple pulp units to be lifted in parallel without requiring complex coordination mechanisms between trolleys, thus maintaining high productivity while minimizing complexity
Data Source
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AI summary
An apparatus for lifting items, such as pulp units, bound together by strapping means, the apparatus including at least one horizontal beam (1) attached to a crane and the beam having a plural number of hook trolleys (3) attached thereto and movable along the beam, each hook trolley (3) located at an item to be lifted being arranged to grab the strapping means of the item when grabbing means (4) belonging to the trolleys are made to approach one another, the strapping means being thus suspended from the grabbing means. The hook trolleys (3) are provided with either one or two grabbing member pairs at a fixed distance from one another, their grabbing movement being a parallel movement and each hook trolley (3) being at an adjustable distance from another one, suspended either by a slot arrangement (2) from said horizontal beam (1), the slot arrangement (2) permitting each hook trolley (3) to move separately in a vertical direction for a predetermined distance and to tilt to a predetermined angle in the slot attachment, or via an intermediate beam (8) from said horizontal beam (1), each intermediate beam (8) being fastened so as to hang from the horizontal beam (1) by the slot arrangement (2), the intermediate beam (8) being transverse to the horizontal beam (1) and the slot arrangement (2) permitting each hook trolley (3) or hook trolley pair to move separately in a vertical direction for a predetermined distance and to tilt to a predetermined angle in the slot attachment.